Nick,
You may not:
- modify, translate, reverse engineer, decompile, disassemble (except to
the extent applicable >laws specifically prohibit such restriction),
As far as I know does that not fit in our laws because again as far as I
know exactly our laws prohibit these restrictions.
You have to write something that when there are modification or additions
needed you are prepared to make them to a decent price and not allow the
user of the software to make those additions themselves than after a
commitment between you and them. However this text just as example and
probably to simple to be complete.
I really would look on the site of a British Organisation of software
builders, probably will there be an example how to do it.
Cor